Creative fatigue: the number, and what it hides
The decline in an ad's performance as the audience sees it repeatedly.
Why creative fatigue matters
It is the reason creative supply caps an account. Every ad has a working life, and when it ends the choice is a replacement or a rising CPA. Brands without a replacement ready pay the rising CPA by default.
What this looks like with real numbers
An ad runs at a $32 cost per purchase for three weeks. In week four it drifts to $38, week five $46, while frequency climbs from 1.9 to 4.2. Nothing in the account changed. That is fatigue, and the only real fix is a replacement that was briefed before the drift started.
What it does not tell you
Not every decline is fatigue. Seasonality, a competitor's launch, an audience that has simply been exhausted, and a landing page change all look identical in the chart.
The mistake people actually make
Responding by raising the budget. More spend against a fatigued creative accelerates the frequency climb and makes next week worse.
Questions, answered.
How do you calculate creative fatigue?
No single formula: watch cost per result rising while frequency rises. The decline in an ad's performance as the audience sees it repeatedly.
What goes wrong with creative fatigue?
Responding by raising the budget. More spend against a fatigued creative accelerates the frequency climb and makes next week worse.
What does creative fatigue not tell me?
Not every decline is fatigue. Seasonality, a competitor's launch, an audience that has simply been exhausted, and a landing page change all look identical in the chart.
Change the creative, not the dashboard
The decline in an ad's performance as the audience sees it repeatedly.